And the reason why no terminology has grown naturally yet is pretty simple: collisions still really suck. Two remodels want to remodel two estates, not one remodel. You want to use your second vault as a vault, not as a copper. Both consolation prizes are way too awful to legitimize a special terminology.
Not really. I don't think it's usually a good idea to buy more Remodels so that you can Remodel Remodels, but Vault's discard-for-benefit ability most certainly makes you want to buy more Vaults than you would buy, say, Moats. The reason why the terminology hasn't grown naturally is that the strategic functionality of these types of terminals compared to others is useful when thinking about what you can do with that particular card, but not really very useful when thinking about Dominion strategy in general — i.e. if we're talking about playing Vault/big money, we can say things like "you want to buy at least 3 Vaults", but if we're talking about a card/situation/strategy X, we never say things like "in general, X works well with Remodel/Vault type cards". The principle of "you (might) want to buy more copies of Remodel/Vault type terminals than other terminals" is present in the former statement, but you can communicate the thought without using a term for Remodel/Vault type cards (actually, it's more convenient, too) since you're just referring to a particular card of that type.